• Elevated and slowly increasing serum alpha-fetoprotein levels after two years of age |
• Low serum levels of immunoglobulins (IgA, IgG, IgG subclasses, IgE) and lymphopenia (particularly affecting T-lymphocytes) |
• Spontaneous and X-ray induced chromosomal breaks and rearrangements in cultured lymphocytes and fibroblasts |
• Reduced survival of cultured lymphocytes and fibroblasts after exposure to ionizing radiation [209] |
• Cerebellar atrophy detected by MRI |